Spark plug



Wmw'. 1 1,517,211

W. A. GRUBER SPARK PLUG Filed July 1 1,, 19,22

WENNIE ALOUIS GRUBEB, 0F PINE RIVER, MINNESOTA.

SPARK PLUG.

Application filed July 11, 1922. Serial No. 574,278.

To all whom it may concern:

Be it known that I, Wnnrun ALoUIs GRUBER, a citizen of the United States of America, residing, at Pine River, in the county of Cass and State of Minnesota, have invented new and useful Improvements in Spark Plugs, of which the following is a specification.

The object of the invention is to provide a simplified construction of spark plug for internal combustion or explosion engines and in that connection to provide a sparking device by which the accumulation of carbon or other deposits suiiiciently to interfere with the formation of a proper spark may be prevented to insure a proper operative condition of the terminals without resorting to periodical cleaning thereof and incidentally removal of the sparking means for that purpose; and with this object in view the invention consists in a construction and combination of parts of which a preferred embodiment is shown in the accompanying drawings, wherein Figure 1 is a view of a sparking appliance constructed in accordance with the invention arranged in operative position in a cylinder head.

Figure 2 is a detail view of one of the sparking elements or terminals.

The device consists essentially ofa sparking or positive terminal seated in an insulating plug 11 fitted in a suitable opening 12 in the wall 13 of a cylinder with its extremity arranged in the path of a grounding or negative terminal 14c carried by the intake valve 15 of the cylinder, said valve in the construction illustrated being of the poppet type and having a stem 16 for valve seat ing actuation by a spring 17, the relations be tween the parts being such that upon the unseating of the intake valve due to suction caused by the inward movement of the piston 18, the terminal 14 will be brought into rubhing contact with the extremity of the sparking or positive terminal.

In the construction illustrated the positive or sparking terminal is provided with a ring or eye shaped extremity 19 and the negative or grounding terminal is provided with a globular or ball shaped extremity 20 adapted to engage the ring or eye as the intake valve is withdrawn from its seat under the suction stroke of the engine. Moreover in the construction illustrated the stem of the positive or sparking terminal is of a yielding or resilient material adapted for deflection or slight displacement by the pressure of the terminal carried by the intake valve so that on each suction stroke of the engine the valve carried terminal comes into contact with the yielding terminal with sufficient force to deflect the latter and thereby rub the surface of the ring or eye sufficiently to remove therefrom any carbon or soot which may have been deposited thereon between sparks of the engine and maintain the surface in a bright condition suitable for the transmission of an efiicient spark.

Any ordinary or conventional form of igniting mechanism having any preferred arrangement of connections may be used with the sparking device constructed as disclosed herein and therefore specific illustration of such means and connections is deemed unnecessary.

Having described the hivention, what is claimed as new and useful is A sparking apparatus having an insulated positive terminal arranged in the path of movement of a negative or grounding terminal carried by the intake valve of a. cylinder, the first-named terminal being provided at its extremity with a ring or eye, and the secondnamed terminal having a globular extremity for engagement with the ring or eve.

In testimony whereof he has aflixed his signature.

VVENNIE ALOUIS GRUBER. 

